A doctor mistaken for a thief. A cleaning lady treated like a slave. A mother who lost a son killed by the police. What do they have in common? Their skin color. A documentary that unveils the structural racism rooted in Brazilian society.

Em 1933, o detetive aposentado Hercule Poirot é alvo de um assassino provocador que envia cartas assinadas "ABC", que Poirot deve decodificar para descobrir a identidade do assassino.